Question

why lead acetate paper turns black when it comes in contact with h2s gas??

Answer 1

Lead acetate on coming in contact with H2S gas forms lead sulfide which is black in color.
So, the paper turns black

Hope this helps!

Answer 2

Lead acetate paper turns black when it comes in contact with $H_2S$ gas due to the formation of compound called lead sulfide.

• Lead acetate ($Pb(CH_3COO)_2$)is a white crystalline substance with a sweetish taste and is highly dis solvable in water and glycerine.
• It is utilized to identify the presence of $H_2S$ (hydrogen sulfide).
• When lead acetate is introduced in the environment where hydrogen sulfide gas is present, a black color precipitate is formed due to the formation of lead sulfide as shown in the following chemical reaction:

• $Pb(CH_3COO)_2+H_2S \rightarrow PbS + 2 CH_3COOH_2$

Learn more about lead acetate

A colorless solution of potassium iodide and lead acetate are mixed when a colored precipitate is formed. Answer the following;

i) What kind of chemical reaction takes place

ii) Write a balanced chemical equation for the reaction

iii) What is the formula and color of precipitate

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Lead acetate cotton wool is used in the limit test for arsenic to

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